Double box
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Double box is a term in broadcast news for a graphical overlay on the screen with two rectangular "holes" where two separate [video source]s are inserted. A double box is typically used for two live shots from different locations, with a conversation taking place between the participants; i.e., an interview, or a dialog between a remote reporter and an anchor in the studio.
The double box graphic is created and controlled from a character generator, such as a Chyron or Deko. The video sources are then mixed together by a switcher for play to air.
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